Anime: Because I can be doing other things while "watching" it and get more done the only bad thing is it goes slow in some shows.
Manga: Because for the slower series like Naruto (slow for me anyway in anime form) I can zip through it while still liking it while I'm reading but I can't be doing anything else.
So yeah, they both have their ups and downs, so yeah it's really hard to decide on one or the other. ^^
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